Cobalt complex monoazo dyestuffs



United States Patent 3,221,004 COBALT COMPLEX MONOAZO DYESTUFFS Reinhard Neier, Basel, Switzerland, assignor to Sandoz Ltd., Basel, Switzerland No Drawing. Filed Apr. 1, 1963, Ser. No. 269,708 Claims priority, application Switzerland, Apr. 12, 1962, 4,467/ 62 6 Claims. (Cl. 260151) This invention relates to monoazo dyes and their metal complex compounds which in the metal free form correspond to the formula wherein X and Y represent hydrogen, halogen, alkyl or alkoxy, and the NH group stands in the adjacent position to the N N group.

These new dyes (I) can conveniently be prepared by coupling 1 mole of the diazo compound of an amine of the formula NI-I U Y (II) with 1 mole of a compound of the formula in the position adjacent to the NI-I group.

The coupling reaction of the diazotized amino compound of Formula II with a compound of Formula III is performed advantageously in acid aqueous medium.

The new azo dyes may be metallized either in substance or on the fiber, cobalt being the preferred metal. They can be treated with a cobalt-yielding agent in such a manner that a cobalt-containing azo dye is formed which contains essentially one cobalt atom in complex combination with two molecules of the azo compound residue. For the production of these 1:2 cobalt complex compounds it is preferable to allow an amount of a cobalt-yielding agent containing less than two but at least one atom of cobalt to act upon two molecules of the azo compound.

The metallizing reaction yielding cobalt complexes is carried out most advantageously in an alkaline aqueous or organic medium, to which the cobalt compound is added in the presence of compounds which maintain the cobalt dissolved in complex combination in caustic-alkaline medium, e.g., tartaric, citric or lactic acid.

Examples of suitable cobalt compounds are cobaltous formate, cobaltous acetate and cobaltous sulfate. The resulting cobalt complex compounds are precipitated from the aqueous medium by the addition of salt, filtered, washed if necessary, and dried.

On metallization of a mixture of one or more monoazo dyes of Formula I according to the invention with other metallizable azo dyes, valuable metal complex dyes, preferably heterogeneous cobalt complex dyes are obtained, the shade and dyeing properties of which can be modified to suit a particular use by changing the mixture of azo compounds.

The mixing ratio of the dyes of Formula I with any other metallizable azo dye can be varied Within wide limits. In most cases equimolar amounts of the tWo dyes are metallized, though it is also possible to employ mixtures containing 2080 mol-percent of one or the other starting dye.

The azo dyes obtained are suitable for the dyeing of natural and synthetic polyamide fibers, wool, silk, and leather in blue, grey and green shades. On aftertreatment with suitable cobalt compounds in the same or a fresh bath, the dyeings are fast to light and Wet treatments, e.g., fastness to washing, water, sea water, perspiration, carbonizing, bleaching, milling, rubbing, pressing, acids, alkalis, stoving and cross-dyeing.

The homogeneous or heterogeneous cobalt-containing azo dyes produced in substance are readily soluble in water and dye wool, silk, leather and polyamide fibers from neutral or weakly acid dyebaths in grey, blue and green shades having good light fastness and good wet fastness properties, e.g., fastness to washing, water, sea water, perspiration, carbonizing, bleaching, milling, rubbing, pressing, acids, alkalis, stoving and cross-dyeing. The slight sensitivity to hard Water and good suitability for high-temperature dyeing are other notable features of these dyes.

The homogeneous or heterogeneous cobalt-containing azo dyes produced in substance are also well soluble in polar solvents such as alcohols, ketones and carboxylic acid esters, e.g. glycols, glycol ethers, ethanol, acetone, acetic acid ethyl ester, propionic acid ethyl ester, amylacetate, etc. These solubility properties make them suitable for the dyeing and printing of leather, the mass coloration of artificial fibers in solution in organic solvents, and the coloration of plastics and paint and lacquer media. In these materials they yield grey, blue and green shades of very good light fastness and good wet fastness properties.

In the following examples the parts and percentages are by weight and the temperatures in degrees centigrade.

Example 1 21.7 parts of the monoazo dye produced by coupling diazotized Z-amino-1-hydroxy-4-chlorobenzene with 2- a'minon aphthalene 6 sulfonic acid (2' hydroxy)-propyl dried and ground. It is a dark powder which dissolves in water to give reddish blue solutions. It dyes wool, silk, leather and polyarnide fibers in navy blue shades. Owing to its good solubility in organic solvents it is suitable for ple 1, 0.4 part of ammonium sulfate and 0.1 part of cobaltous sulfate. At 40, 10 parts of previously wetted-out wool are entered in the bath. It is heated to 100 in 20 minutes and held at this temperature for 1 hour. During the coloration of fiber-forming materials in solution, e.g., this time 2 parts of acetic acid are dropped into the cellulose secondary acetate and polyacrylonitrile, and of bath and the water lost by evaporation is replaced from plastics and lacquers e.g. vinyl and nitrocellulose lacquers, time to time. On removal from the bath the wool is rinsed in navy blue shades. and dried. It is dyed to a navy blue shade.

Dyeing Example A Nylon and other polyamide fibers are dyed with this 1O dye in exactly the same Way as wool. Silk also is dyed 3 the dye Obtamed accordmg to Example} are on the same lines, except that the temperature of the dyedissolved in 100 parts of hot Water and the solutlon diluted bath is ke t at durin d ein Leather and a to 4000 parts with water at 4050 In this solution 100 p g y p Per are dyed by the methods normally used in practice. Forparts of previously wetted-out wool are entered. After mulae of representative dyes of the foregoing examples the dropwise addition of 2 parts of acetic acid the dyeare as follows. bath is heated to 100 over 30 minutes. It is held at this Exam le 1 temperature for a further hour, after which the dyed wool p rfamovedz nnsed Wlth Water and A Q l The 1:2 cobalt complex compound of the monoaza dye dyeing having excellent fastness to light, washing, millof the formula ing and perspiration is obtained.

Further starting materials for the production of homo- 0H IITHI geneous monoazo dyes and cobalt-containing azo dyes according to the particulars of Example 1 are set forth in Table 1. In column (I) of the table the diazo component is listed, in column (11) the coupling component, and in OH column (III) the shade of the dyeing of the cobalt-con- J; (g taining dye on wool. 1 sOFNE-OHP H-CHK TABLE 1 Shade of Cobalt Exam Diazo Component Azo Component Complex Comple N 0 pound on Wool (I) (II) (III) 2 2-amlno-1-hydroxy-A-ehlorobenzene 2aminonaphthalene-5-sulfonlcacid-(2'-hvdroxy)-propylamide Grey. a rlo l-aminonaphtha1ene-5-sulf0n1caeld-(2-hydroxy)-propylamide Olive-grey. 4 dr\ l-aminonaphthalenetsulfonieacid-(2-hydroxy)-propylamide Violet-blue. 5 Z-amino,l-hydroxy-t,G-dichlorobenzene Z-aruinonaphthalene-fi-sulionicacid-(2'-hydroxy)-propylamlde Greenish blue. 6 2-amino-1-hydroxyl-chloro-o-methylbenzene d Blue. 7 2-amino-1-hydroxy-emethoxybenzene n Do. 8 2-amino-l-hydroxy-4bromob Do.

2-amin0-1-hydroxybonzene 22minonaphthalene-fi-sulfonicacid-(2-hydroxy)-propylamlde Blue-grey. 2amino-1-hydr0xy-4-tert. butylbenzene ..d0 Blue. Z-arnino-1-hydroxy-4-tert.amylbenzene zaruinonaphthalene-5-sulfonicacid-(2-hydroxy)-propylamlde Grey.

Dyeing Example B 1n the metal complex form 100 parts of secondary cellulose acetate with a con- 5 tent of 5455% splittable acetic acid are dissolved in 300 parts of a suitable solvent, e.g., a mixture of 275 parts of acetone and 25 parts of methanol, and allowed to swell Cl overnight.

2 parts of the cobalt-containing dye obtained according to the procedure of Example 1 are dissolved in 60 parts N of the same solvent. This solution is added to the cellun lose acetate dope and the whole stirred until 60 parts of N CO I solvent have evaporated. It is then filtered through, cot- H ton and a filter press. The further stages of the process to the formation of the filament are the same as in the production of uncolored acetate filaments. The filament is dyed to a deep navy-blue shade which has good light and so wet fastness properties. 2 2 3 Dyeing Example C OH 2 A lacquer solution is prepared with 20 parts of the vinyl chloride-vinyl acetate copolymer composition Vinylite VMCH, 70 parts of methylethyl ketone and 10 parts of ethylene glycol. 0.5 part of the cobalt-containing Example H dye obtained according to Example 1 are stirred into 10 parts of the identical lacquer solution and this solution diluted with 25 parts of a 1:1 mixture of methylethyl ketone and cyclohexanone. The two solutions are intimately blended, applied to aluminium sheet and the coating air dried. It is of blue color and has good light fastness.

Dyeing Example D A dyebath is prepared with 1000 parts of water, 0.2

part of the metal-free dye produced according to Exam- 3, 22 1, 004 5 6 in the metal complex form N it Co N H r S0 ---NH--CH CH--C/H3 Example III Example IV The 1:2 cobalt complex compound of the monoazo dye The 1:2 cobalt complex compound of the monoazo of the formula 35 dye of the formula OH NH: 11 lTIH,

1 SOTNHCHP 01 SOgNHCHz-7HCHa in the metal complex form 7 8 in the metal complex form in complex union to the number of molecules of monoazo dye residues being substantially 1:2.

1 2. The 1:2 cobalt complex of the formula CO H SO -NH-CH -(EH-CH OH SO NH CH 2 --CH-CH 2 2 3 n.- H

O 2 Example V The 1:2 cobalt complex compound of the monoazo dye of the formula OH 11TH: 3. The 1:2 cobalt complex of the formula H3O N=N8 OH 01 OrNHCH JHCH in the metal complex form H l N u H N 9 SO --NH-CH -CH--CH Having thus disclosed the invention what is claimed is: 1. A cobalt complex compound of monoazo dye of the formula L NH: 0H 5. The 1:2 cobalt complex of the formula Y N=N- so2-NH-cH,-e11om T Cl I C l X wherein X is a member selected from the group consisting N of H and Cl, and Y is a member selected from the group CO consisting of H, CH and C1, at least one of X and Y N NH H being C1, the NH group and the -N=N- group each is in one of the positions 1 and 2 of the naphthalene moiety and the S0NH-OHz-CHCH:

(5H SO NH CH (EH CH group is in one of the positions 4, 5 and 6 of the said OH ,2 moiety, the ratio of the number of cobalt atoms bound .L

6. The 1:2 cobalt complex of the formula I -CH-CH References Cited by the Examiner UNITED STATES PATENTS 10 CHARLES B. PARKER, Primary Examiner. 

1. A COBALT COMPLEX COMPOUND OF MONOAZO DYE OF THE FORMULA 